<template>
  <div class="upload-box">
    <el-upload
      v-model:file-list="_fileList"
      :accept="fileType.join(',')"
      action="#"
      :before-upload="beforeUpload"
      :class="['upload', self_disabled ? 'disabled' : '', drag ? 'no-border' : '']"
      :disabled="self_disabled"
      :drag="drag"
      :http-request="handleHttpUpload"
      :limit="limit"
      list-type="picture-card"
      :multiple="true"
      :on-error="uploadError"
      :on-exceed="handleExceed"
      :on-success="uploadSuccess"
    >
      <div class="upload-empty">
        <slot name="empty">
          <el-icon><plus /></el-icon>
          <!-- <span>请上传图片</span> -->
        </slot>
      </div>
      <!-- 图片里面编辑功能 -->
      <template #file="{ file }">
        <img class="upload-image" :src="file.url" />
        <div class="upload-handle" @click.stop>
          <div class="handle-icon" @click="handlePictureCardPreview(file)">
            <el-icon><zoom-in /></el-icon>
            <span>查看</span>
          </div>
          <div v-if="!self_disabled" class="handle-icon" @click="handleRemove(file)">
            <el-icon><delete /></el-icon>
            <span>删除</span>
          </div>
        </div>
      </template>
    </el-upload>
    <div class="el-upload__tip">
      <slot name="tip"></slot>
    </div>
    <!-- 图片预览 -->
    <el-image-viewer v-if="imgViewVisible" :url-list="[viewImageUrl]" @close="imgViewVisible = false" />
  </div>
</template>

<script setup lang="ts" name="UploadImgs">
import { Plus } from '@element-plus/icons-vue'
import type { UploadFile, UploadProps, UploadRequestOptions, UploadUserFile } from 'element-plus'
import { ElNotification, formContextKey, formItemContextKey } from 'element-plus'
import { computed, inject, ref, watch } from 'vue'
import { uploadImg } from '/@/api/upload'

interface UploadFileProps {
  fileList: UploadUserFile[]
  api?: (params: any) => Promise<any> // 上传图片的 api 方法，一般项目上传都是同一个 api 方法，在组件里直接引入即可 ==> 非必传
  drag?: boolean // 是否支持拖拽上传 ==> 非必传（默认为 true）
  disabled?: boolean // 是否禁用上传组件 ==> 非必传（默认为 false）
  limit?: number // 最大图片上传数 ==> 非必传（默认为 5张）
  fileSize?: number // 图片大小限制 ==> 非必传（默认为 5M）
  fileType?: File.ImageMimeType[] // 图片类型限制 ==> 非必传（默认为 ["image/jpeg", "image/png", "image/gif"]）
  height?: string // 组件高度 ==> 非必传（默认为 150px）
  width?: string // 组件宽度 ==> 非必传（默认为 150px）
  borderRadius?: string // 组件边框圆角 ==> 非必传（默认为 8px）
}

// 父传子数据 withDefaults：给父传子数据默认值并且具有响应式
const props = withDefaults(defineProps<UploadFileProps>(), {
  fileList: () => [], // 照片数组
  drag: true, // 允许拖拽上传
  disabled: false, // 是否禁用
  limit: 5, // 上传数量最大值
  fileSize: 5, // 每张图片限制大小
  fileType: () => ['image/jpeg', 'image/png', 'image/gif'], // 图片格式
  height: '150px', // 宽高
  width: '150px',
  borderRadius: '8px', // 边框圆角
})

// 获取 el-form 组件上下文
const formContext = inject(formContextKey, void 0)
// 获取 el-form-item 组件上下文
const formItemContext = inject(formItemContextKey, void 0)
// 判断是否禁用上传和删除
const self_disabled = computed(() => {
  return props.disabled || formContext?.disabled
})

// watch(
//   () => formContext,
//   val => {
//     console.log(23234, val);
//   },
//   {
//     immediate: true,
//     deep: true
//   }
// );

const _fileList = ref<UploadUserFile[]>(props.fileList)

// 监听 props.fileList 列表默认值改变
watch(
  () => props.fileList, // 父传子数据
  (n: UploadUserFile[]) => {
    _fileList.value = n
  }
)

/**
 * @description 文件上传之前判断
 * @param rawFile 选择的文件
 * */
const beforeUpload: UploadProps['beforeUpload'] = (rawFile) => {
  const imgSize = rawFile.size / 1024 / 1024 < props.fileSize
  const imgType = props.fileType.includes(rawFile.type as File.ImageMimeType)
  if (!imgType)
    ElNotification({
      title: '温馨提示',
      message: '上传图片不符合所需的格式！',
      type: 'warning',
    })
  if (!imgSize)
    setTimeout(() => {
      ElNotification({
        title: '温馨提示',
        message: `上传图片大小不能超过 ${props.fileSize}M!`,
        type: 'warning',
      })
    }, 0)
  return imgType && imgSize
}

/**
 * @description 图片上传
 * @param options upload 所有配置项
 * */
const handleHttpUpload = async (options: UploadRequestOptions) => {
  let formData = new FormData()
  formData.append('file', options.file)
  try {
    const api = props.api ?? uploadImg
    const { data } = await api(formData)
    options.onSuccess(data)
  } catch (error) {
    options.onError(error as any)
  }
}

/**
 * @description 图片上传成功
 * @param response 上传响应结果
 * @param uploadFile 上传的文件
 * */
interface UploadEmits {
  (e: 'update:fileList', value: UploadUserFile[]): void
}
const emit = defineEmits<UploadEmits>()
const uploadSuccess = (response: { fileUrl: string } | undefined, uploadFile: UploadFile) => {
  if (!response) return
  uploadFile.url = response.fileUrl
  emit('update:fileList', _fileList.value)
  // 调用 el-form 内部的校验方法（可自动校验）
  formItemContext?.prop && formContext?.validateField([formItemContext.prop as string])
  ElNotification({
    title: '温馨提示',
    message: '图片上传成功！',
    type: 'success',
  })
}

/**
 * @description 删除图片
 * @param file 删除的文件
 * */
//  删除图片
const handleRemove = (file: UploadFile) => {
  _fileList.value = _fileList.value.filter((item) => item.url !== file.url || item.name !== file.name)
  emit('update:fileList', _fileList.value)
}

/**
 * @description 图片上传错误
 * */
const uploadError = () => {
  ElNotification({
    title: '温馨提示',
    message: '图片上传失败，请您重新上传！',
    type: 'error',
  })
}

/**
 * @description 文件数超出
 * */
const handleExceed = () => {
  ElNotification({
    title: '温馨提示',
    message: `当前最多只能上传 ${props.limit} 张图片，请移除后上传！`,
    type: 'warning',
  })
}

/**
 * @description 图片预览
 * @param file 预览的文件
 * */
const viewImageUrl = ref('')
const imgViewVisible = ref(false)
// 打开图片预览，大图
const handlePictureCardPreview: UploadProps['onPreview'] = (file) => {
  viewImageUrl.value = file.url!
  imgViewVisible.value = true
}
</script>

<style scoped lang="scss">
.is-error {
  .upload {
    :deep(.el-upload--picture-card),
    :deep(.el-upload-dragger) {
      border: 1px dashed var(--el-color-danger) !important;
      &:hover {
        border-color: var(--el-color-primary) !important;
      }
    }
  }
}
:deep(.disabled) {
  .el-upload--picture-card,
  .el-upload-dragger {
    cursor: not-allowed;
    background: var(--el-disabled-bg-color) !important;
    border: 1px dashed var(--el-border-color-darker);
    &:hover {
      border-color: var(--el-border-color-darker) !important;
    }
  }
}
.upload-box {
  .no-border {
    :deep(.el-upload--picture-card) {
      border: none !important;
    }
  }
  :deep(.upload) {
    .el-upload-dragger {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 100%;
      height: 100%;
      padding: 0;
      overflow: hidden;
      border: 1px dashed var(--el-border-color-darker);
      border-radius: v-bind(borderRadius);
      &:hover {
        border: 1px dashed var(--el-color-primary);
      }
    }
    .el-upload-dragger.is-dragover {
      background-color: var(--el-color-primary-light-9);
      border: 2px dashed var(--el-color-primary) !important;
    }
    .el-upload-list__item,
    .el-upload--picture-card {
      width: v-bind(width);
      height: v-bind(height);
      background-color: transparent;
      border-radius: v-bind(borderRadius);
    }
    .upload-image {
      width: 100%;
      height: 100%;
      object-fit: contain;
    }
    .upload-handle {
      position: absolute;
      top: 0;
      right: 0;
      box-sizing: border-box;
      display: flex;
      align-items: center;
      justify-content: center;
      width: 100%;
      height: 100%;
      cursor: pointer;
      background: rgb(0 0 0 / 60%);
      opacity: 0;
      transition: var(--el-transition-duration-fast);
      .handle-icon {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        padding: 0 6%;
        color: aliceblue;
        .el-icon {
          margin-bottom: 15%;
          font-size: 140%;
        }
        span {
          font-size: 100%;
        }
      }
    }
    .el-upload-list__item {
      &:hover {
        .upload-handle {
          opacity: 1;
        }
      }
    }
    .upload-empty {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 12px;
      line-height: 30px;
      color: var(--el-color-info);
      .el-icon {
        font-size: 28px;
        color: var(--el-text-color-secondary);
      }
    }
  }
  .el-upload__tip {
    line-height: 15px;
    text-align: center;
  }
}
</style>
